import re
from collections.abc import MutableMapping
from datetime import datetime
from zoneinfo import ZoneInfo

import pytest
from django.core.cache import cache
from django.db import models
from django.http.request import HttpRequest
from django.test import TestCase, override_settings
from django.urls import include, path, re_path
from django.utils.safestring import SafeText
from django.utils.translation import gettext_lazy as _

from rest_framework import permissions, serializers, status
from rest_framework.decorators import action
from rest_framework.permissions import BasePermission
from rest_framework.renderers import (
    AdminRenderer, BaseRenderer, BrowsableAPIRenderer, HTMLFormRenderer,
    JSONRenderer, StaticHTMLRenderer
)
from rest_framework.request import Request
from rest_framework.response import Response
from rest_framework.routers import SimpleRouter
from rest_framework.settings import api_settings
from rest_framework.test import APIRequestFactory, URLPatternsTestCase
from rest_framework.utils import json
from rest_framework.views import APIView
from rest_framework.viewsets import ViewSet

DUMMYSTATUS = status.HTTP_200_OK
DUMMYCONTENT = 'dummycontent'


def RENDERER_A_SERIALIZER(x):
    return ('Renderer A: %s' % x).encode('ascii')


def RENDERER_B_SERIALIZER(x):
    return ('Renderer B: %s' % x).encode('ascii')


expected_results = [
    ((elem for elem in [1, 2, 3]), JSONRenderer, b'[1,2,3]')  # Generator
]


class DummyTestModel(models.Model):
    name = models.CharField(max_length=42, default='')


class BasicRendererTests(TestCase):
    def test_expected_results(self):
        for value, renderer_cls, expected in expected_results:
            output = renderer_cls().render(value)
            self.assertEqual(output, expected)


class RendererA(BaseRenderer):
    media_type = 'mock/renderera'
    format = "formata"

    def render(self, data, media_type=None, renderer_context=None):
        return RENDERER_A_SERIALIZER(data)


class RendererB(BaseRenderer):
    media_type = 'mock/rendererb'
    format = "formatb"

    def render(self, data, media_type=None, renderer_context=None):
        return RENDERER_B_SERIALIZER(data)


class MockView(APIView):
    renderer_classes = (RendererA, RendererB)

    def get(self, request, **kwargs):
        return Response(DUMMYCONTENT, status=DUMMYSTATUS)


class MockGETView(APIView):
    def get(self, request, **kwargs):
        return Response({'foo': ['bar', 'baz']})


class MockPOSTView(APIView):
    def post(self, request, **kwargs):
        return Response({'foo': request.data})


class EmptyGETView(APIView):
    renderer_classes = (JSONRenderer,)

    def get(self, request, **kwargs):
        return Response(status=status.HTTP_204_NO_CONTENT)


class HTMLView(APIView):
    renderer_classes = (BrowsableAPIRenderer, )

    def get(self, request, **kwargs):
        return Response('text')


class HTMLView1(APIView):
    renderer_classes = (BrowsableAPIRenderer, JSONRenderer)

    def get(self, request, **kwargs):
        return Response('text')


urlpatterns = [
    re_path(r'^.*\.(?P<format>.+)$', MockView.as_view(renderer_classes=[RendererA, RendererB])),
    path('', MockView.as_view(renderer_classes=[RendererA, RendererB])),
    path('cache', MockGETView.as_view()),
    path('parseerror', MockPOSTView.as_view(renderer_classes=[JSONRenderer, BrowsableAPIRenderer])),
    path('html', HTMLView.as_view()),
    path('html1', HTMLView1.as_view()),
    path('empty', EmptyGETView.as_view()),
    path('api', include('rest_framework.urls', namespace='rest_framework'))
]


class POSTDeniedPermission(permissions.BasePermission):
    def has_permission(self, request, view):
        return request.method != 'POST'


class POSTDeniedView(APIView):
    renderer_classes = (BrowsableAPIRenderer,)
    permission_classes = (POSTDeniedPermission,)

    def get(self, request):
        return Response()

    def post(self, request):
        return Response()

    def put(self, request):
        return Response()

    def patch(self, request):
        return Response()


class DocumentingRendererTests(TestCase):
    def test_only_permitted_forms_are_displayed(self):
        view = POSTDeniedView.as_view()
        request = APIRequestFactory().get('/')
        response = view(request).render()
        self.assertNotContains(response, '>POST<')
        self.assertContains(response, '>PUT<')
        self.assertContains(response, '>PATCH<')


@override_settings(ROOT_URLCONF='tests.test_renderers')
class RendererEndToEndTests(TestCase):
    """
    End-to-end testing of renderers using an RendererMixin on a generic view.
    """
    def test_default_renderer_serializes_content(self):
        """If the Accept header is not set the default renderer should serialize the response."""
        resp = self.client.get('/')
        self.assertEqual(resp['Content-Type'], RendererA.media_type + '; charset=utf-8')
        self.assertEqual(resp.content, RENDERER_A_SERIALIZER(DUMMYCONTENT))
        self.assertEqual(resp.status_code, DUMMYSTATUS)

    def test_head_method_serializes_no_content(self):
        """No response must be included in HEAD requests."""
        resp = self.client.head('/')
        self.assertEqual(resp.status_code, DUMMYSTATUS)
        self.assertEqual(resp['Content-Type'], RendererA.media_type + '; charset=utf-8')
        self.assertEqual(resp.content, b'')

    def test_default_renderer_serializes_content_on_accept_any(self):
        """If the Accept header is set to */* the default renderer should serialize the response."""
        resp = self.client.get('/', HTTP_ACCEPT='*/*')
        self.assertEqual(resp['Content-Type'], RendererA.media_type + '; charset=utf-8')
        self.assertEqual(resp.content, RENDERER_A_SERIALIZER(DUMMYCONTENT))
        self.assertEqual(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_serializes_content_default_case(self):
        """If the Accept header is set the specified renderer should serialize the response.
        (In this case we check that works for the default renderer)"""
        resp = self.client.get('/', HTTP_ACCEPT=RendererA.media_type)
        self.assertEqual(resp['Content-Type'], RendererA.media_type + '; charset=utf-8')
        self.assertEqual(resp.content, RENDERER_A_SERIALIZER(DUMMYCONTENT))
        self.assertEqual(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_serializes_content_non_default_case(self):
        """If the Accept header is set the specified renderer should serialize the response.
        (In this case we check that works for a non-default renderer)"""
        resp = self.client.get('/', HTTP_ACCEPT=RendererB.media_type)
        self.assertEqual(resp['Content-Type'], RendererB.media_type + '; charset=utf-8')
        self.assertEqual(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEqual(resp.status_code, DUMMYSTATUS)

    def test_unsatisfiable_accept_header_on_request_returns_406_status(self):
        """If the Accept header is unsatisfiable we should return a 406 Not Acceptable response."""
        resp = self.client.get('/', HTTP_ACCEPT='foo/bar')
        self.assertEqual(resp.status_code, status.HTTP_406_NOT_ACCEPTABLE)

    def test_specified_renderer_serializes_content_on_format_query(self):
        """If a 'format' query is specified, the renderer with the matching
        format attribute should serialize the response."""
        param = '?%s=%s' % (
            api_settings.URL_FORMAT_OVERRIDE,
            RendererB.format
        )
        resp = self.client.get('/' + param)
        self.assertEqual(resp['Content-Type'], RendererB.media_type + '; charset=utf-8')
        self.assertEqual(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEqual(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_serializes_content_on_format_kwargs(self):
        """If a 'format' keyword arg is specified, the renderer with the matching
        format attribute should serialize the response."""
        resp = self.client.get('/something.formatb')
        self.assertEqual(resp['Content-Type'], RendererB.media_type + '; charset=utf-8')
        self.assertEqual(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEqual(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_is_used_on_format_query_with_matching_accept(self):
        """If both a 'format' query and a matching Accept header specified,
        the renderer with the matching format attribute should serialize the response."""
        param = '?%s=%s' % (
            api_settings.URL_FORMAT_OVERRIDE,
            RendererB.format
        )
        resp = self.client.get('/' + param,
                               HTTP_ACCEPT=RendererB.media_type)
        self.assertEqual(resp['Content-Type'], RendererB.media_type + '; charset=utf-8')
        self.assertEqual(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEqual(resp.status_code, DUMMYSTATUS)

    def test_parse_error_renderers_browsable_api(self):
        """Invalid data should still render the browsable API correctly."""
        resp = self.client.post('/parseerror', data='foobar', content_type='application/json', HTTP_ACCEPT='text/html')
        self.assertEqual(resp['Content-Type'], 'text/html; charset=utf-8')
        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)

    def test_204_no_content_responses_have_no_content_type_set(self):
        """
        Regression test for #1196

        https://github.com/encode/django-rest-framework/issues/1196
        """
        resp = self.client.get('/empty')
        self.assertEqual(resp.get('Content-Type', None), None)
        self.assertEqual(resp.status_code, status.HTTP_204_NO_CONTENT)

    def test_contains_headers_of_api_response(self):
        """
        Issue #1437

        Test we display the headers of the API response and not those from the
        HTML response
        """
        resp = self.client.get('/html1')
        self.assertContains(resp, '>GET, HEAD, OPTIONS<')
        self.assertContains(resp, '>application/json<')
        self.assertNotContains(resp, '>text/html; charset=utf-8<')


_flat_repr = '{"foo":["bar","baz"]}'
_indented_repr = '{\n  "foo": [\n    "bar",\n    "baz"\n  ]\n}'


def strip_trailing_whitespace(content):
    """
    Seems to be some inconsistencies re. trailing whitespace with
    different versions of the json lib.
    """
    return re.sub(' +\n', '\n', content)


class BaseRendererTests(TestCase):
    """
    Tests BaseRenderer
    """
    def test_render_raise_error(self):
        """
        BaseRenderer.render should raise NotImplementedError
        """
        with pytest.raises(NotImplementedError):
            BaseRenderer().render('test')


class JSONRendererTests(TestCase):
    """
    Tests specific to the JSON Renderer
    """

    def test_render_lazy_strings(self):
        """
        JSONRenderer should deal with lazy translated strings.
        """
        ret = JSONRenderer().render(_('test'))
        self.assertEqual(ret, b'"test"')

    def test_render_queryset_values(self):
        o = DummyTestModel.objects.create(name='dummy')
        qs = DummyTestModel.objects.values('id', 'name')
        ret = JSONRenderer().render(qs)
        data = json.loads(ret.decode())
        self.assertEqual(data, [{'id': o.id, 'name': o.name}])

    def test_render_queryset_values_list(self):
        o = DummyTestModel.objects.create(name='dummy')
        qs = DummyTestModel.objects.values_list('id', 'name')
        ret = JSONRenderer().render(qs)
        data = json.loads(ret.decode())
        self.assertEqual(data, [[o.id, o.name]])

    def test_render_dict_abc_obj(self):
        class Dict(MutableMapping):
            def __init__(self):
                self._dict = {}

            def __getitem__(self, key):
                return self._dict.__getitem__(key)

            def __setitem__(self, key, value):
                return self._dict.__setitem__(key, value)

            def __delitem__(self, key):
                return self._dict.__delitem__(key)

            def __iter__(self):
                return self._dict.__iter__()

            def __len__(self):
                return self._dict.__len__()

            def keys(self):
                return self._dict.keys()

        x = Dict()
        x['key'] = 'string value'
        x[2] = 3
        ret = JSONRenderer().render(x)
        data = json.loads(ret.decode())
        self.assertEqual(data, {'key': 'string value', '2': 3})

    def test_render_obj_with_getitem(self):
        class DictLike:
            def __init__(self):
                self._dict = {}

            def set(self, value):
                self._dict = dict(value)

            def __getitem__(self, key):
                return self._dict[key]

        x = DictLike()
        x.set({'a': 1, 'b': 'string'})
        with self.assertRaises(TypeError):
            JSONRenderer().render(x)

    def test_float_strictness(self):
        renderer = JSONRenderer()

        # Default to strict
        for value in [float('inf'), float('-inf'), float('nan')]:
            with pytest.raises(ValueError):
                renderer.render(value)

        renderer.strict = False
        assert renderer.render(float('inf')) == b'Infinity'
        assert renderer.render(float('-inf')) == b'-Infinity'
        assert renderer.render(float('nan')) == b'NaN'

    def test_without_content_type_args(self):
        """
        Test basic JSON rendering.
        """
        obj = {'foo': ['bar', 'baz']}
        renderer = JSONRenderer()
        content = renderer.render(obj, 'application/json')
        # Fix failing test case which depends on version of JSON library.
        self.assertEqual(content.decode(), _flat_repr)

    def test_with_content_type_args(self):
        """
        Test JSON rendering with additional content type arguments supplied.
        """
        obj = {'foo': ['bar', 'baz']}
        renderer = JSONRenderer()
        content = renderer.render(obj, 'application/json; indent=2')
        self.assertEqual(strip_trailing_whitespace(content.decode()), _indented_repr)


class UnicodeJSONRendererTests(TestCase):
    """
    Tests specific for the Unicode JSON Renderer
    """
    def test_proper_encoding(self):
        obj = {'countries': ['United Kingdom', 'France', 'España']}
        renderer = JSONRenderer()
        content = renderer.render(obj, 'application/json')
        self.assertEqual(content, '{"countries":["United Kingdom","France","España"]}'.encode())

    def test_u2028_u2029(self):
        # The \u2028 and \u2029 characters should be escaped,
        # even when the non-escaping unicode representation is used.
        # Regression test for #2169
        obj = {'should_escape': '\u2028\u2029'}
        renderer = JSONRenderer()
        content = renderer.render(obj, 'application/json')
        self.assertEqual(content, b'{"should_escape":"\\u2028\\u2029"}')


class AsciiJSONRendererTests(TestCase):
    """
    Tests specific for the Unicode JSON Renderer
    """
    def test_proper_encoding(self):
        class AsciiJSONRenderer(JSONRenderer):
            ensure_ascii = True
        obj = {'countries': ['United Kingdom', 'France', 'España']}
        renderer = AsciiJSONRenderer()
        content = renderer.render(obj, 'application/json')
        self.assertEqual(content, b'{"countries":["United Kingdom","France","Espa\\u00f1a"]}')


# Tests for caching issue, #346
@override_settings(ROOT_URLCONF='tests.test_renderers')
class CacheRenderTest(TestCase):
    """
    Tests specific to caching responses
    """
    def test_head_caching(self):
        """
        Test caching of HEAD requests
        """
        response = self.client.head('/cache')
        cache.set('key', response)
        cached_response = cache.get('key')
        assert isinstance(cached_response, Response)
        assert cached_response.content == response.content
        assert cached_response.status_code == response.status_code

    def test_get_caching(self):
        """
        Test caching of GET requests
        """
        response = self.client.get('/cache')
        cache.set('key', response)
        cached_response = cache.get('key')
        assert isinstance(cached_response, Response)
        assert cached_response.content == response.content
        assert cached_response.status_code == response.status_code


class TestJSONIndentationStyles:
    def test_indented(self):
        renderer = JSONRenderer()
        data = {"a": 1, "b": 2}
        assert renderer.render(data) == b'{"a":1,"b":2}'

    def test_compact(self):
        renderer = JSONRenderer()
        data = {"a": 1, "b": 2}
        context = {'indent': 4}
        assert (
            renderer.render(data, renderer_context=context) ==
            b'{\n    "a": 1,\n    "b": 2\n}'
        )

    def test_long_form(self):
        renderer = JSONRenderer()
        renderer.compact = False
        data = {"a": 1, "b": 2}
        assert renderer.render(data) == b'{"a": 1, "b": 2}'


class TestHiddenFieldHTMLFormRenderer(TestCase):
    def test_hidden_field_rendering(self):
        class TestSerializer(serializers.Serializer):
            published = serializers.HiddenField(default=True)

        serializer = TestSerializer(data={})
        serializer.is_valid()
        renderer = HTMLFormRenderer()
        field = serializer['published']
        rendered = renderer.render_field(field, {})
        assert rendered == ''


class TestDateTimeFieldHTMLFormRender(TestCase):
    """
    Default USE_TZ is True.
    Default TIME_ZONE is 'America/Chicago'.
    """

    def _assert_datetime_rendering(self, appointment, expected, datetimefield_kwargs=None):
        datetimefield_kwargs = datetimefield_kwargs or {}

        class TestSerializer(serializers.Serializer):
            appointment = serializers.DateTimeField(**datetimefield_kwargs)

        serializer = TestSerializer(data={"appointment": appointment})
        serializer.is_valid()
        renderer = HTMLFormRenderer()
        field = serializer['appointment']
        rendered = renderer.render_field(field, {})
        expected_html = (
            '<input name="appointment" class="form-control" '
            f'type="datetime-local" value="{expected}">'
        )

        self.assertInHTML(expected_html, rendered)

    def test_datetime_field_rendering_milliseconds(self):
        self._assert_datetime_rendering(
            datetime(2024, 12, 24, 0, 55, 30, 345678), "2024-12-24T00:55:30.345"
        )

    def test_datetime_field_rendering_no_seconds_and_no_milliseconds(self):
        self._assert_datetime_rendering(
            datetime(2024, 12, 24, 0, 55, 0, 0), "2024-12-24T00:55:00.000"
        )

    def test_datetime_field_rendering_with_format_as_none(self):
        self._assert_datetime_rendering(
            datetime(2024, 12, 24, 0, 55, 30, 345678),
            "2024-12-24T00:55:30.345",
            {"format": None}
        )

    def test_datetime_field_rendering_with_format(self):
        self._assert_datetime_rendering(
            datetime(2024, 12, 24, 0, 55, 30, 345678),
            "2024-12-24T00:55:00.000",
            {"format": "%a %d %b %Y, %I:%M%p"}
        )

    # New project templates default to 'UTC'.
    @override_settings(TIME_ZONE='UTC')
    def test_datetime_field_rendering_utc(self):
        self._assert_datetime_rendering(
            datetime(2024, 12, 24, 0, 55, 30, 345678),
            "2024-12-24T00:55:30.345"
        )

    @override_settings(REST_FRAMEWORK={'DATETIME_FORMAT': '%a %d %b %Y, %I:%M%p'})
    def test_datetime_field_rendering_with_custom_datetime_format(self):
        self._assert_datetime_rendering(
            datetime(2024, 12, 24, 0, 55, 30, 345678),
            "2024-12-24T00:55:00.000"
        )

    @override_settings(REST_FRAMEWORK={'DATETIME_FORMAT': None})
    def test_datetime_field_rendering_datetime_format_is_none(self):
        self._assert_datetime_rendering(
            datetime(2024, 12, 24, 0, 55, 30, 345678),
            "2024-12-24T00:55:30.345"
        )

    # Enforce it in True because in Django versions under 4.2 was False by default.
    @override_settings(USE_TZ=True)
    def test_datetime_field_rendering_timezone_aware_datetime(self):
        self._assert_datetime_rendering(
            datetime(2024, 12, 24, 0, 55, 30, 345678, tzinfo=ZoneInfo('Asia/Tokyo')),  # +09:00
            "2024-12-23T09:55:30.345"  # Rendered in -06:00
        )

    def test_datetime_field_rendering_empty_string_raises_no_error(self):
        """
        Regression test for #9927 (issue):
        Ensures that an empty string value doesn't cause a ValueError
        when the HTMLFormRenderer tries to parse it via fromisoformat.
        """
        self._assert_datetime_rendering("", "")

    def test_datetime_field_rendering_none_value_raises_no_error(self):
        """
        Additional regression coverage for #9927:
        Ensures that a None value, which is converted to an empty string
        by as_form_field(), doesn't cause a ValueError when rendered.
        """
        self._assert_datetime_rendering(None, "")


class TestHTMLFormRenderer(TestCase):
    def setUp(self):
        class TestSerializer(serializers.Serializer):
            test_field = serializers.CharField()

        self.renderer = HTMLFormRenderer()
        self.serializer = TestSerializer(data={})

    def test_render_with_default_args(self):
        self.serializer.is_valid()
        renderer = HTMLFormRenderer()

        result = renderer.render(self.serializer.data)

        self.assertIsInstance(result, SafeText)

    def test_render_with_provided_args(self):
        self.serializer.is_valid()
        renderer = HTMLFormRenderer()

        result = renderer.render(self.serializer.data, None, {})

        self.assertIsInstance(result, SafeText)


class TestChoiceFieldHTMLFormRenderer(TestCase):
    """
    Test rendering ChoiceField with HTMLFormRenderer.
    """

    def setUp(self):
        choices = ((1, 'Option1'), (2, 'Option2'), (12, 'Option12'))

        class TestSerializer(serializers.Serializer):
            test_field = serializers.ChoiceField(choices=choices,
                                                 initial=2)

        self.TestSerializer = TestSerializer
        self.renderer = HTMLFormRenderer()

    def test_render_initial_option(self):
        serializer = self.TestSerializer()
        result = self.renderer.render(serializer.data)

        self.assertIsInstance(result, SafeText)

        self.assertInHTML('<option value="2" selected>Option2</option>',
                          result)
        self.assertInHTML('<option value="1">Option1</option>', result)
        self.assertInHTML('<option value="12">Option12</option>', result)

    def test_render_selected_option(self):
        serializer = self.TestSerializer(data={'test_field': '12'})

        serializer.is_valid()
        result = self.renderer.render(serializer.data)

        self.assertIsInstance(result, SafeText)

        self.assertInHTML('<option value="12" selected>Option12</option>',
                          result)
        self.assertInHTML('<option value="1">Option1</option>', result)
        self.assertInHTML('<option value="2">Option2</option>', result)


class TestMultipleChoiceFieldHTMLFormRenderer(TestCase):
    """
    Test rendering MultipleChoiceField with HTMLFormRenderer.
    """

    def setUp(self):
        self.renderer = HTMLFormRenderer()

    def test_render_selected_option_with_string_option_ids(self):
        choices = (('1', 'Option1'), ('2', 'Option2'), ('12', 'Option12'),
                   ('}', 'OptionBrace'))

        class TestSerializer(serializers.Serializer):
            test_field = serializers.MultipleChoiceField(choices=choices)

        serializer = TestSerializer(data={'test_field': ['12']})
        serializer.is_valid()

        result = self.renderer.render(serializer.data)

        self.assertIsInstance(result, SafeText)

        self.assertInHTML('<option value="12" selected>Option12</option>',
                          result)
        self.assertInHTML('<option value="1">Option1</option>', result)
        self.assertInHTML('<option value="2">Option2</option>', result)
        self.assertInHTML('<option value="}">OptionBrace</option>', result)

    def test_render_selected_option_with_integer_option_ids(self):
        choices = ((1, 'Option1'), (2, 'Option2'), (12, 'Option12'))

        class TestSerializer(serializers.Serializer):
            test_field = serializers.MultipleChoiceField(choices=choices)

        serializer = TestSerializer(data={'test_field': ['12']})
        serializer.is_valid()

        result = self.renderer.render(serializer.data)

        self.assertIsInstance(result, SafeText)

        self.assertInHTML('<option value="12" selected>Option12</option>',
                          result)
        self.assertInHTML('<option value="1">Option1</option>', result)
        self.assertInHTML('<option value="2">Option2</option>', result)


class StaticHTMLRendererTests(TestCase):
    """
    Tests specific for Static HTML Renderer
    """
    def setUp(self):
        self.renderer = StaticHTMLRenderer()

    def test_static_renderer(self):
        data = '<html><body>text</body></html>'
        result = self.renderer.render(data)
        assert result == data

    def test_static_renderer_with_exception(self):
        context = {
            'response': Response(status=500, exception=True),
            'request': Request(HttpRequest())
        }
        result = self.renderer.render({}, renderer_context=context)
        assert result == '500 Internal Server Error'


class BrowsableAPIRendererTests(URLPatternsTestCase):
    class ExampleViewSet(ViewSet):
        def list(self, request):
            return Response()

        @action(detail=False, name="Extra list action")
        def list_action(self, request):
            raise NotImplementedError

    class AuthExampleViewSet(ExampleViewSet):
        permission_classes = [permissions.IsAuthenticated]

    class SimpleSerializer(serializers.Serializer):
        name = serializers.CharField()

    router = SimpleRouter()
    router.register('examples', ExampleViewSet, basename='example')
    router.register('auth-examples', AuthExampleViewSet, basename='auth-example')
    urlpatterns = [path('api/', include(router.urls))]

    def setUp(self):
        self.renderer = BrowsableAPIRenderer()
        self.renderer.accepted_media_type = ''
        self.renderer.renderer_context = {}

    def test_render_form_for_serializer(self):
        with self.subTest('Serializer'):
            serializer = BrowsableAPIRendererTests.SimpleSerializer(data={'name': 'Name'})
            form = self.renderer.render_form_for_serializer(serializer)
            assert isinstance(form, str), 'Must return form for serializer'

        with self.subTest('ListSerializer'):
            list_serializer = BrowsableAPIRendererTests.SimpleSerializer(data=[{'name': 'Name'}], many=True)
            form = self.renderer.render_form_for_serializer(list_serializer)
            assert form is None, 'Must not return form for list serializer'

    def test_get_raw_data_form(self):
        with self.subTest('Serializer'):
            class DummyGenericViewsetLike(APIView):
                def get_serializer(self, **kwargs):
                    return BrowsableAPIRendererTests.SimpleSerializer(**kwargs)

                def get(self, request):
                    response = Response()
                    response.view = self
                    return response

                post = get

            view = DummyGenericViewsetLike.as_view()
            _request = APIRequestFactory().get('/')
            request = Request(_request)
            response = view(_request)
            view = response.view

            raw_data_form = self.renderer.get_raw_data_form({'name': 'Name'}, view, 'POST', request)
            assert raw_data_form['_content'].initial == '{\n    "name": ""\n}'

        with self.subTest('ListSerializer'):
            class DummyGenericViewsetLike(APIView):
                def get_serializer(self, **kwargs):
                    return BrowsableAPIRendererTests.SimpleSerializer(many=True, **kwargs)  # returns ListSerializer

                def get(self, request):
                    response = Response()
                    response.view = self
                    return response

                post = get

            view = DummyGenericViewsetLike.as_view()
            _request = APIRequestFactory().get('/')
            request = Request(_request)
            response = view(_request)
            view = response.view

            raw_data_form = self.renderer.get_raw_data_form([{'name': 'Name'}], view, 'POST', request)
            assert raw_data_form['_content'].initial == '[\n    {\n        "name": ""\n    }\n]'

    def test_get_description_returns_empty_string_for_401_and_403_statuses(self):
        assert self.renderer.get_description({}, status_code=401) == ''
        assert self.renderer.get_description({}, status_code=403) == ''

    def test_get_filter_form_returns_none_if_data_is_not_list_instance(self):
        class DummyView:
            get_queryset = None
            filter_backends = None

        result = self.renderer.get_filter_form(data='not list',
                                               view=DummyView(), request={})
        assert result is None

    def test_extra_actions_dropdown(self):
        resp = self.client.get('/api/examples/', HTTP_ACCEPT='text/html')
        assert 'id="extra-actions-menu"' in resp.content.decode()
        assert '/api/examples/list_action/' in resp.content.decode()
        assert '>Extra list action<' in resp.content.decode()

    def test_extra_actions_dropdown_not_authed(self):
        resp = self.client.get('/api/unauth-examples/', HTTP_ACCEPT='text/html')
        assert 'id="extra-actions-menu"' not in resp.content.decode()
        assert '/api/examples/list_action/' not in resp.content.decode()
        assert '>Extra list action<' not in resp.content.decode()


class AdminRendererTests(TestCase):

    def setUp(self):
        self.renderer = AdminRenderer()

    def test_render_when_resource_created(self):
        class DummyView(APIView):
            renderer_classes = (AdminRenderer, )
        request = Request(HttpRequest())
        request.build_absolute_uri = lambda: 'http://example.com'
        response = Response(status=201, headers={'Location': '/test'})
        context = {
            'view': DummyView(),
            'request': request,
            'response': response
        }

        result = self.renderer.render(data={'test': 'test'},
                                      renderer_context=context)
        assert result == ''
        assert response.status_code == status.HTTP_303_SEE_OTHER
        assert response['Location'] == 'http://example.com'

    def test_render_dict(self):
        factory = APIRequestFactory()

        class DummyView(APIView):
            renderer_classes = (AdminRenderer, )

            def get(self, request):
                return Response({'foo': 'a string'})
        view = DummyView.as_view()
        request = factory.get('/')
        response = view(request)
        response.render()
        self.assertContains(response, '<tr><th>Foo</th><td>a string</td></tr>', html=True)

    def test_render_dict_with_items_key(self):
        factory = APIRequestFactory()

        class DummyView(APIView):
            renderer_classes = (AdminRenderer, )

            def get(self, request):
                return Response({'items': 'a string'})

        view = DummyView.as_view()
        request = factory.get('/')
        response = view(request)
        response.render()
        self.assertContains(response, '<tr><th>Items</th><td>a string</td></tr>', html=True)

    def test_render_dict_with_iteritems_key(self):
        factory = APIRequestFactory()

        class DummyView(APIView):
            renderer_classes = (AdminRenderer, )

            def get(self, request):
                return Response({'iteritems': 'a string'})

        view = DummyView.as_view()
        request = factory.get('/')
        response = view(request)
        response.render()
        self.assertContains(response, '<tr><th>Iteritems</th><td>a string</td></tr>', html=True)

    def test_get_result_url(self):
        factory = APIRequestFactory()

        class DummyGenericViewsetLike(APIView):
            lookup_field = 'test'

            def get(self, request):
                response = Response()
                response.view = self
                return response

            def reverse_action(view, *args, **kwargs):
                self.assertEqual(kwargs['kwargs']['test'], 1)
                return '/example/'

        # get the view instance instead of the view function
        view = DummyGenericViewsetLike.as_view()
        request = factory.get('/')
        response = view(request)
        view = response.view

        self.assertEqual(self.renderer.get_result_url({'test': 1}, view), '/example/')
        self.assertIsNone(self.renderer.get_result_url({}, view))

    def test_get_result_url_no_result(self):
        factory = APIRequestFactory()

        class DummyView(APIView):
            lookup_field = 'test'

            def get(self, request):
                response = Response()
                response.view = self
                return response

        # get the view instance instead of the view function
        view = DummyView.as_view()
        request = factory.get('/')
        response = view(request)
        view = response.view

        self.assertIsNone(self.renderer.get_result_url({'test': 1}, view))
        self.assertIsNone(self.renderer.get_result_url({}, view))

    def test_get_context_result_urls(self):
        factory = APIRequestFactory()

        class DummyView(APIView):
            lookup_field = 'test'

            def reverse_action(view, url_name, args=None, kwargs=None):
                return '/%s/%d' % (url_name, kwargs['test'])

        # get the view instance instead of the view function
        view = DummyView.as_view()
        request = factory.get('/')
        response = view(request)

        data = [
            {'test': 1},
            {'url': '/example', 'test': 2},
            {'url': None, 'test': 3},
            {},
        ]
        context = {
            'view': DummyView(),
            'request': Request(request),
            'response': response
        }

        context = self.renderer.get_context(data, None, context)
        results = context['results']

        self.assertEqual(len(results), 4)
        self.assertEqual(results[0]['url'], '/detail/1')
        self.assertEqual(results[1]['url'], '/example')
        self.assertEqual(results[2]['url'], None)
        self.assertNotIn('url', results[3])

    def test_invalid_post_request_shows_validation_error(self):
        factory = APIRequestFactory()

        class DummySerializer(serializers.Serializer):
            name = serializers.CharField()

            def validate_name(self, value):
                raise serializers.ValidationError("any-post-is-invalid")

        class DummyView(APIView):
            renderer_classes = (AdminRenderer,)
            serializer_class = DummySerializer

            def get(self, request):
                return Response({'content': 'page-content-on-get'})

            def post(self, request):
                serializer = DummySerializer(data=request.data)
                serializer.is_valid(raise_exception=True)
                return Response(serializer.data)

        view = DummyView.as_view()
        request = factory.post('/', {'name': 'anything'})
        response = view(request)
        response.render()

        # Render normal page
        self.assertContains(response, 'page-content-on-get', status_code=400)
        # The validation error is surfaced through the bound error form
        self.assertContains(response, 'any-post-is-invalid', status_code=400)

    def test_invalid_post_request_missing_get_permissions(self):
        factory = APIRequestFactory()

        class PostOnlyPermission(BasePermission):
            def has_permission(self, request, view):
                return request.method == "POST"

        class DummyView(APIView):
            renderer_classes = (AdminRenderer,)
            permission_classes = (PostOnlyPermission,)

            def get(self, request):
                return Response({'content': 'super-duper-secret'})

            def post(self, request):
                raise serializers.ValidationError("any-post-is-invalid")

        view = DummyView.as_view()
        request = factory.post('/')
        response = view(request)
        response.render()

        # We should not leak private data
        self.assertNotContains(response, 'super-duper-secret', status_code=400)

        # We should show the validation error instead
        self.assertContains(response, 'any-post-is-invalid', status_code=400)

    def test_invalid_post_request_missing_get_permissions_with_serializer(self):
        factory = APIRequestFactory()

        class PostOnlyPermission(BasePermission):
            def has_permission(self, request, view):
                return request.method == "POST"

        class DummySerializer(serializers.Serializer):
            name = serializers.CharField()

            def validate_name(self, value):
                raise serializers.ValidationError("any-post-is-invalid")

        class DummyView(APIView):
            renderer_classes = (AdminRenderer,)
            permission_classes = (PostOnlyPermission,)
            serializer_class = DummySerializer

            def get(self, request):
                return Response({'content': 'super-duper-secret'})

            def post(self, request):
                serializer = DummySerializer(data=request.data)
                serializer.is_valid(raise_exception=True)
                return Response(serializer.data)

        view = DummyView.as_view()
        request = factory.post('/', {'name': 'anything'})
        response = view(request)
        response.render()

        # Even with a serializer (and its bound error form), the denied GET
        # representation must not leak.
        self.assertNotContains(response, 'super-duper-secret', status_code=400)

        # We should still show the validation error.
        self.assertContains(response, 'any-post-is-invalid', status_code=400)
